<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        
        while (true) {
            //**用户登录验证**
            let uname = prompt('请输入用户名')
            let password = prompt('请输入密码')
            let num = 1
            if (uname == 'admin' && password == '123456') {
                alert('登录成功')
                break
            } else {
                alert('登录失败,请重新输入用户名和密码')
               
            }
        
        }


    </script>
</body>

</html>